How can I use mongodb aggregation pipeline in koolreport?

I know the simple find and projection example of mongoDB which koolreport supports?

'collection' => 'sales',
        'find' => ['age' => ['$gte' => '40']],
        'options' => [
            'skip' => 0,
            'limit' => 5,
            'projection' => [
                '_id' => 0,
                'name' => 1,
                'age' => 1,
            ],    
        ],

But what if I have to $match, $group and $unwind these aggregation operators in query? How should I use this with above query?